Liquid fuel injection pumps



Jan. 20, 1970 WQRBY LIQUID FUEL INJECTION PUMPS Filed July 9, 1968 INVE NTOR M w 4 m ATTORNEYS United States Patent US. Cl. 103-153 2 Claims ABSTRACT OF THE DISCLOSURE A liquid fuel injection pump including a body part, a pump barrel mounted within the body part and extending therefrom, a sleeve mounted about the exposed portion of the pump barrel and retained axially relative to the body part but angularly movable about the barrel, a slit extending from the end of the sleeve remote from the body part, a pumping plunger mounted within the pump barrel and having a peg engaged within the slits, the sleeve being deformed so as to define ear portions at the open end of the slit whereby the pumping plunger is retained relative to the remaining portion of the pump.

This invention relates to liquid fuel injection pumps of the kind comprising a body part, a plunger reciprocably mounted within the body part, a sleeve retained upon the body part at one end thereof and angularly movable thereon about the axis of reciprocation of the plunger, an open ended slit extending from the end of the sleeve remote from the body part and a peg secured to the plunger and engaged within said slit whereby angular movement of the sleeve will impart angular movement to the plunger, the plunger being allowed free axial movement relative to the sleeve.

With such pumps the problem exists of preventing the plunger falling out of the body part during transprotation of the pump. In the part with an open ended slit, a circlip has been positioned in a groove formed in the internal periphery of the sleeve to provide interference with the peg and thereby to retain the plunger together with the associated parts. In another example the slit is provided with a closed end.

The object of the present invention is to provide such a pump in a simple and convenient form.

According to the invention in a pump of the kind specified the open end of the slit is partially closed by deforming a portion of the sleeve.

One example of a liquid fuel in jection pump in accordance with the invention will now be described with refernece to the accompanying drawing which is a side elevation of one example of a pump in accordance with the invention.

The injection pump comprises a body part in which in known manner, is mounted a pump barrel 16 which defines a pump cylinder. From the inner end of the cylin- I der extends an outlet 17 which can be connected to an injection nozzle of an associated internal combustion engine and a non-return delivery valve 18 is provided for controlling the flow of fuel through said outlet. Formed in the wall of the cylinder is a port 19 which is in communication with a source of liquid fuel and reciprocably mounted within the cylinder is a plunger 10. The plunger extends from the pump barrel and in known manner dur- "ice ing inward movement of the plunger and when the port 19 is covered by the plunger fuel will flow past the delivery valve 18 to the outlet 17. During the return motion of the plunger as soon as the port is uncovered, fuel will fiow into the pump cylinder ready for delivery to the engine during the next inward stroke of the plunger.

Mounted about the barrel 16 is a sleeve 11 which is restrained against axial movement relative to the body part by means of a retaining ring 22 but is permitted angular movemenet about the axis of reciprocation of the plunger. Furthermore, the sleeve is provided with a radially extending pin 19a for attachment to a manually or governor operable adjustor whereby the angular setting of the sleeve can be adjusted. The pin 19a extends through an aperture formed in the housing.

The exposed end of the plunger is provided with an abutment 20 for a coiled compression spring 21 which acts in a direction to urge the plunger out of the pump cylinder. Furthermore, the sleeve 11 is provided with a slit 12 which extends axially from the end of the sleeve remote from the body part. Located within the slit is a peg 13 which is secured to the plunger 10 whereby angular adjustment of the sleeve 11 will effect angular adjustment of the plunger but at the same time the plunger is permitted free axial movement relative to the sleeve.

In order to prevent the plunger 10 falling out of the cylinder when the injection pump is transported the open end of the slit 12 is partially closed and this is effected by deforming the sleeve on opposite sides of the slit so as to define a pair of ears 14. In this manner the peg 13 cannot pass out of the slit so that the plunger together with the spring abutment and the spring are retained relative to the remaining parts of the injection pump.

Having thus described my invention what I claim as new and desire to secure by Letters Patent is:

1. A liquid fuel injection pump comprising a body part, a plunger reciprocably mounted within the body part, a sleeve attached to the body part at one end thereof, means mounting the sleeve on said body part to permit angular movement thereon about the axis of reciprocation of the plunger, an open ended slit extending from the end of the sleeve remote from the body part and a peg secured to the plunger and engaged within said slit whereby angular movement of the sleeve will impart angular movement to the plunger, the plunger being allowed free axial movement relative to the sleeve, and in .which the open end of the slit is partially closed by deforming a portion of the sleeve to thereby prevent the plunger from falling out of the body part.

2. A liquid fuel injection pump as claimed in claim 1 in which the sleeve is deformed on opposite sides of the slit to define a pair of cars at the open end of the slot with which the peg co-operates.

References Cited UNITED STATES PATENTS 1,556,149 10/1925 Koppelman "103-153 2,608,825 9/1952 Cheesman 1o3 153 2,694,977 11/1954 Rotter 103 153 HENRY F. RADUAZO, Primary Examiner US. Cl. X.R. 1031 5 4 

